In chemistry, describing an atom or substituent that is part of the main ring structure of a molecule (the opposite of exocyclic).
From Greek 'eso-' (inside) plus 'cyclic' (from Greek 'kyklos,' circle). This chemistry term distinguishes between atoms inside or outside a molecule's ring structure.
Organic chemists think about molecules like architects—they map out whether atoms are inside the 'ring' structure or hanging outside it, and this distinction matters hugely for how the molecule behaves chemically.
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